Issues Week 1 bloom 1000 watt HPS

I have 3 big bud and 4 gelatos girls growing so happily 3 weeks into veg. Then suddenly one of the big buds leaves begins to turn a weird light green and dark green. Some a little yellow. They have been on a cal mag and botanicare veg feed cycle for the whole time. I had just started to flush with just PH balanced water and some cal mag and noticed this.

should I feed her? Or should I flush her hard? Let me know! These girls are in a 5x5 tent. 1000 watt hps light and 5 gallon smart pots. All organic soil media.

They don't look like normal hungry plants, they look funky. That could be a reaction to the nutes or the flushing. I know nothing about flushing or what benefit it could have. It sounds like drowning to me.